Quarterly report pursuant to Section 13 or 15(d)

Real Estate and Intangible Assets - Pro-Forma Condensed Consolidated Statements of Operations (Parenthetical) (Detail)

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Real Estate and Intangible Assets - Pro-Forma Condensed Consolidated Statements of Operations (Parenthetical) (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Business Combinations [Abstract]        
Impairment charge $ 622 $ 280 $ 622 $ 14,238